CVE-2024-38588: ftrace: Fix possible use-after-free issue in ftrace_location()
First published: Wed Jun 19 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: ftrace: Fix possible use-after-free issue in ftrace_location() KASAN reports a bug: BUG: KASAN: use-after-free in ftrace_location+0x90/0x120 Read of size 8 at addr ffff888141d40010 by task insmod/424 CPU: 8 PID: 424 Comm: insmod Tainted: G W 6.9.0-rc2+ [...] Call Trace: <TASK> dump_stack_lvl+0x68/0xa0 print_report+0xcf/0x610 kasan_report+0xb5/0xe0 ftrace_location+0x90/0x120 register_kprobe+0x14b/0xa40 kprobe_init+0x2d/0xff0 [kprobe_example] do_one_initcall+0x8f/0x2d0 do_init_module+0x13a/0x3c0 load_module+0x3082/0x33d0 init_module_from_file+0xd2/0x130 __x64_sys_finit_module+0x306/0x440 do_syscall_64+0x68/0x140 entry_SYSCALL_64_after_hwframe+0x71/0x79 The root cause is that, in lookup_rec(), ftrace record of some address is being searched in ftrace pages of some module, but those ftrace pages at the same time is being freed in ftrace_release_mod() as the corresponding module is being deleted: CPU1 | CPU2 register_kprobes() { | delete_module() { check_kprobe_address_safe() { | arch_check_ftrace_location() { | ftrace_location() { | lookup_rec() // USE! | ftrace_release_mod() // Free! To fix this issue: 1. Hold rcu lock as accessing ftrace pages in ftrace_location_range(); 2. Use ftrace_location_range() instead of lookup_rec() in ftrace_location(); 3. Call synchronize_rcu() before freeing any ftrace pages both in ftrace_process_locs()/ftrace_release_mod()/ftrace_free_mem().
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=3.7<6.1.93 | |
| Linux Linux kernel | >=6.2<6.6.33 | |
| Linux Linux kernel | >=6.7<6.8.12 | |
| Linux Linux kernel | >=6.9<6.9.3 | |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.115-1 6.1.119-1 6.11.10-1 6.12.3-1 |
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Reference Links
- https://git.kernel.org/stable/c/31310e373f4c8c74e029d4326b283e757edabc0b
- https://git.kernel.org/stable/c/66df065b3106964e667b37bf8f7e55ec69d0c1f6
- https://git.kernel.org/stable/c/7b4881da5b19f65709f5c18c1a4d8caa2e496461
- https://git.kernel.org/stable/c/dbff5f0bfb2416b8b55c105ddbcd4f885e98fada
- https://git.kernel.org/stable/c/e60b613df8b6253def41215402f72986fee3fc8d
- https://launchpad.net/bugs/cve/CVE-2024-38588
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-38588
- https://nvd.nist.gov/vuln/detail/CVE-2024-38588
- https://security-tracker.debian.org/tracker/CVE-2024-38588
- https://ubuntu.com/security/CVE-2024-38588
- https://git.kernel.org/stable/c/1880a324af1c95940a7c954b6b937e86844a33bd
- https://git.kernel.org/stable/c/8ea8ef5e42173560ac510e92a1cc797ffeea8831
- https://git.kernel.org/linus/e60b613df8b6253def41215402f72986fee3fc8d
- https://git.kernel.org/stable/c/eea46baf145150910ba134f75a67106ba2222c1b
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